<?php
/**
 * filename: ext_page.class.php
 * @package:phpbean
 * @author :feifengxlq<feifengxlq#gmail.com>
 * @copyright :Copyright 2006 feifengxlq
 * @license:version 2.0
 * @create:2006-5-31
 * @modify:2006-6-1
 * @modify:feifengxlq 2006-11-4
 * description:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
 * 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
 * example:
 * 模式四种分页模式：
require_once('../libs/classes/page.class.php');
$page=new page(array('total'=>1000,'perpage'=>20));
echo 'mode:1<br>'.$page->show();
echo '<hr>mode:2<br>'.$page->show(2);
echo '<hr>mode:3<br>'.$page->show(3);
echo '<hr>mode:4<br>'.$page->show(4);
开启AJAX：
$ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
echo 'mode:1<br>'.$ajaxpage->show();
采用继承自定义分页显示模式：
 */
class page
{
 /**
  * config ,public
  */
 var $page_name="page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
 var $next_page='>';//下一页
 var $pre_page='<';//上一页
 var $first_page='First';//首页
 var $last_page='Last';//尾页
 var $pre_bar='<<';//上一分页条
 var $next_bar='>>';//下一分页条
 var $format_left='[';
 var $format_right=']';
 var $is_ajax=false;//是否支持AJAX分页模式

 /**
  * private
  *
  */
 var $totalrecord=0;	//记录总数
 var $pagebarnum=5;	//控制记录条的个数, 默认是10
 var $totalpage=0;	//总页数
 var $ajax_action_name='';	//AJAX动作名
 var $nowindex=1;	//当前页
 var $url="";	//url地址头
 var $offset=0;
 var $currentindexstyle="";
 /**
  * constructor构造函数
  *
  * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
  */
 function page($array)
 {
  if(is_array($array)){
   if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'need a param of total');
   $total=intval($array['total']);
   $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
   $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
   $url=(array_key_exists('url',$array))?$array['url']:'';
   $currentindexstyle=(array_key_exists('currentindexstyle',$array))?$array['currentindexstyle']:'';
   $pagebarnum=(array_key_exists('pagebarnum',$array))?$array['pagebarnum']:'5';
  }else{
   $total=$array;
   $perpage=10;
   $nowindex='';
   $url='';
   $currentindexstyle='';
  }
  if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.' is not a positive integer!');
  if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.' is not a positive integer!');
  if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
  $this->_set_nowindex($nowindex);//设置当前页
  $this->_set_url($url);//设置链接地址
  $this->totalpage=ceil($total/$perpage);
  $this->totalrecord=$total;	//设置
  $this->offset=($this->nowindex-1)*$perpage;
  if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
  $this->currentindexstyle=$currentindexstyle;
  $this->pagebarnum=$pagebarnum;
 }
 /**
  * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
  *
  * @param string $var
  * @param string $value
  */
 function set($var,$value)
 {
  if(in_array($var,get_object_vars($this)))
   $this->$var=$value;
  else {
   $this->error(__FUNCTION__,$var." does not belong to PB_Page!");
  }

 }
 /**
  * 打开倒AJAX模式
  *
  * @param string $action 默认ajax触发的动作。
  */
 function open_ajax($action)
 {
  $this->is_ajax=true;
  $this->ajax_action_name=$action;
 }
 /**
  * 获取显示"下一页"的代码
  *
  * @param string $style
  * @return string
  */
 function next_page($style='')
 {
  if($this->nowindex<$this->totalpage){
   return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
  }
  return '<span class="'.$style.'">'.$this->next_page.'</span>';
 }

 /**
  * 获取显示“上一页”的代码
  *
  * @param string $style
  * @return string
  */
 function pre_page($style='')
 {
  if($this->nowindex>1){
   return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
  }
  return '<span class="'.$style.'">'.$this->pre_page.'</span>';
 }

 /**
  * 获取显示“首页”的代码
  *
  * @return string
  */
 function first_page($style='')
 {
  if($this->nowindex==1){
   return '<span class="'.$style.'">'.$this->first_page.'</span>';
  }
  return $this->_get_link($this->_get_url(1),$this->first_page,$style);
 }

 /**
  * 获取显示“尾页”的代码
  *
  * @return string
  */
 function last_page($style='')
 {
  if($this->nowindex==$this->totalpage){
   return '<span class="'.$style.'">'.$this->last_page.'</span>';
  }
  return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
 }

 function nowbar($style='',$nowindex_style='')
 {
  if ($nowindex_style=='') {
   $nowindex_style="pageindex";
  }
  $plus=ceil($this->pagebarnum/2);
  if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
  $begin=$this->nowindex-$plus+1;
  $begin=($begin>=1)?$begin:1;
  $return='';
  for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
  {
   if($i<=$this->totalpage){
    if($i!=$this->nowindex)
     $return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style), '0');
    else
     $return.=$this->_get_text('<span id="currentpage" class="'.$nowindex_style.'">'.$i.'</span>', '1');
   }else{
    break;
   }
   $return.="\n";
  }
  unset($begin);
  return $return;
 }

 /**
  * 获取显示跳转按钮的代码
  *window.navigate(this.value)
  * @return string
  */
 function select()
 {
  if($this->is_ajax){
   $return='<select name="PB_Page_Select" id="PB_Page_Select"  onChange="'.$this->ajax_action_name.'(this.value);">';
   for($i=1;$i<=$this->totalpage;$i++)
   {
    if($i==$this->nowindex){
     $return.='<option value="'.$i.'" selected>'.$i.'</option>';
    }else{
     $return.='<option value="'.$i.'">'.$i.'</option>';
    }
   }
  }
  else {
   $return='<select name="PB_Page_Select"  onChange="window.navigate(this.value);">';
   for($i=1;$i<=$this->totalpage;$i++)
   {
    if($i==$this->nowindex){
     $return.='<option value="'.$this->url.$i.'" selected>'.$i.'</option>';
    }else{
     $return.='<option value="'.$this->url.$i.'">'.$i.'</option>';
    }
   }
  }
  unset($i);
  $return.='</select>';
  return $return;
 }

 /**
  * 获取mysql 语句中limit需要的值
  *
  * @return string
  */
 function offset()
 {
  return $this->offset;
 }

 /**
  * 控制分页显示风格（你可以增加相应的风格）
  *
  * @param int $mode
  * @return string
  */
 function show($mode=1)
 {
  switch ($mode)
  {
   case '1':
    $this->next_page='下一页';
    $this->pre_page='上一页';
    return "共 <span class=\"pagerecord\">".$this->totalrecord."</span> 记录 &nbsp;&nbsp; 共 <span class=\"pagerecord\">".$this->totalpage."</span> 页   &nbsp;&nbsp; ".$this->pre_page().$this->nowbar('', $this->currentindexstyle).$this->next_page().' &nbsp;&nbsp;&nbsp; 第'.$this->select().'页';
    break;
   case '2':
    $this->next_page='下一页';
    $this->pre_page='上一页';
    $this->first_page='首页';
    $this->last_page='尾页';
    return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
    break;
   case '3':
    $this->next_page='下一页';
    $this->pre_page='上一页';
    $this->first_page='首页';
    $this->last_page='尾页';
    return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
    break;
   case '4':
    $this->next_page='下一页';
    $this->pre_page='上一页';
    return $this->pre_page().$this->nowbar().$this->next_page();
    break;
   case '5':
    return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
    break;
  }

 }
 /*----------------private function (私有方法)-----------------------------------------------------------*/
 /**
  * 设置url头地址
  * @param: String $url
  * @return boolean
  */
 function _set_url($url="")
 {
  if(!empty($url)){
   //手动设置
   $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
  }else{
   //自动获取
   if(empty($_SERVER['QUERY_STRING'])){
    //不存在QUERY_STRING时
    $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
   }else{
    //
    if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
     //地址存在页面参数
     $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
     $last=$this->url[strlen($this->url)-1];
     if($last=='?'||$last=='&'){
      $this->url.=$this->page_name."=";
     }else{
      $this->url.='&'.$this->page_name."=";
     }
    }else{
     //
     $this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
    }//end if
   }//end if
  }//end if
 }

 /**
  * 设置当前页面
  *
  */
 function _set_nowindex($nowindex)
 {
  if(empty($nowindex)){
   //系统获取

   if(isset($_GET[$this->page_name])){
    $this->nowindex=intval($_GET[$this->page_name]);
   }
  }else{
   //手动设置
   $this->nowindex=intval($nowindex);
  }
 }

 /**
  * 为指定的页面返回地址值
  *
  * @param int $pageno
  * @return string $url
  */
 function _get_url($pageno=1)
 {
  return $this->url.$pageno;
 }

 /**
  * 获取分页显示文字，比如说默认情况下_get_text('<a href="">1</a>')将返回[<a href="">1</a>]
  *
  * @param String $str
  * @return string $url
  */
 function _get_text($str, $iscurrentindex)
 {
  $plstr="";
  if ($iscurrentindex=="1") {
   $plstr=" &nbsp; ".$str." &nbsp; ";
  }
  else {
   $plstr=" &nbsp; ".$this->format_left.$str.$this->format_right." &nbsp; ";
  }
  return $plstr;
 }

 /**
  * 获取链接地址
  */
 function _get_link($url,$text,$style=''){
  $style=(empty($style))?'':'class="'.$style.'"';
  if($this->is_ajax){
   //如果是使用AJAX模式   '<a '.$style.' href="javascript:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'</a>';
   $pagelist="";
   if ($text=="上一页") {
    $prevpageno=$this->nowindex-1;
    $pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$prevpageno.')">'.$text.'</a>';
   }
   elseif ($text=="下一页")
   {
    $prevpageno=$this->nowindex+1;
    $pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$prevpageno.')">'.$text.'</a>';
   }
   else
   {
    $pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$text.')">'.$text.'</a>';
   }
   return $pagelist;
  }else{
   return '<a '.$style.' href="'.$url.'">'.$text.'</a>';
  }
 }
 /**
  * 出错处理方式
  */
 function error($function,$errormsg)
 {
  die('Error in file <b>'.__FILE__.'</b> ,Function <b>'.$function.'()</b> :'.$errormsg);
 }
}
?>
